A clumsy or silly person.

One who is acting silly or in a ridiculous manner.

Bufoon, oaf, or otherwise worthy of ridicule.
Stop sliding down the bannister, Stupenagel, you're going to fall off and make the chicks laugh!
by kintatsu April 28, 2009
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A word originating in the 60s. Currently translated as Dumbass, or dipshit. A clueless person or dimwit.
"Take the lens cap off the camera first, stupenagel"
by melliemoo March 15, 2009
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